jquery - How to format/tidy/beautify in JavaScript

Question

How can I format/tidy/beautify HTML in JavaScript? I have tried doing a search/replace for angle brackets (<, >) and indenting accordingly. But of course it does not take into account when the is JS or CSS etc inside the HTML.

The reason I want to do this is I have made a content editor (CMS) which has both WYSIWYG and source code views. The problem the code written by the WYSIWYG editor is normally a single line. So I would like a JavaScript that could format this into a more readable form on demand.

Here what I have so far:

function getIndent(level) {
    var result = '',
        i = level * 4;
    if (level < 0) {
        throw "Level is below 0";
    }
    while (i--) {
        result += ' ';
    }
    return result;
}

function style_html(html) {
    html = html.trim();
    var result = '',
        indentLevel = 0,
        tokens = html.split(/</);
    for (var i = 0, l = tokens.length; i < l; i++) {
        var parts = tokens[i].split(/>/);
        if (parts.length === 2) {
            if (tokens[i][0] === '/') {
                indentLevel--;
            }
            result += getIndent(indentLevel);
            if (tokens[i][0] !== '/') {
                indentLevel++;
            }

            if (i > 0) {
                result += '<';
            }

            result += parts[0].trim() + ">
";
            if (parts[1].trim() !== '') {
                result += getIndent(indentLevel) + parts[1].trim().replace(/s+/g, ' ') + "
";
            }

            if (parts[0].match(/^(img|hr|br)/)) {
                indentLevel--;
            }
        } else {
            result += getIndent(indentLevel) + parts[0] + "
";
        }
    }
    return result;
}

Answer 1

@lovasoa How to format/tidy/beautify in JavaScript is an excellent solution.
rock-solid, much better than vkBeautify or even CodeMirror (hard to use AMD) and VERY easy

<script src='http://lovasoa.github.io/tidy-html5/tidy.js'></script>
<script>
  options = {
  "indent":"auto",
  "indent-spaces":2,
  "wrap":80,
  "markup":true,
  "output-xml":false,
  "numeric-entities":true,
  "quote-marks":true,
  "quote-nbsp":false,
  "show-body-only":true,
  "quote-ampersand":false,
  "break-before-br":true,
  "uppercase-tags":false,
  "uppercase-attributes":false,
  "drop-font-tags":true,
  "tidy-mark":false
}

var html = document.querySelector("body").outerHTML;
var result = tidy_html5(html, options);
console.log(result);
</script>